Those are neat looking flies. I love to fish for Bream with flies. I've used store bought poppers and top water flies and nymphs, but the most effective one I've ever used was one a friend on mine tied and it was dirt simple. He just called it a "Hair Bug" and the closest thing I could find as a pattern was a Griffin Gnat which is what I tie.
When I do fish below surface I have a Hellgrammite pattern that I learned in an Orvis fly tying class years ago. Lots of fun catching Bream and an occasional Bass on a Fly Rod. I am not a purist, far from it. I never really got into all the nuances that went with trout fishing, just enjoy the pond fellows.
Griffin Gnat. (This is a file photo, by the way. Not one I tied)
Mark 1:17 ...I will make you fishers of men